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Linking With External Covariates: Examining Accuracy by Anchor Type, Test Length, Ability Difference, and Sample Size
Umeå University, Faculty of Social Sciences, Umeå School of Business and Economics (USBE), Statistics.ORCID iD: 0000-0001-5549-8262
2019 (English)In: Applied psychological measurement, ISSN 0146-6216, E-ISSN 1552-3497, Vol. 43, no 8, p. 597-610Article in journal (Refereed) Published
Abstract [en]

Research has recently demonstrated the use of multiple anchor tests and external covariates to supplement or substitute for common anchor items when linking and equating with nonequivalent groups. This study examines the conditions under which external covariates improve linking and equating accuracy, with internal and external anchor tests of varying lengths and groups of differing abilities. Pseudo forms of a state science test were equated within a resampling study where sample size ranged from 1,000 to 10,000 examinees and anchor tests ranged in length from eight to 20 items, with reading and math scores included as covariates. Frequency estimation linking with an anchor test and external covariate was found to produce the most accurate results under the majority of conditions studied. Practical applications of linking with anchor tests and covariates are discussed.

Place, publisher, year, edition, pages
Sage Publications, 2019. Vol. 43, no 8, p. 597-610
Keywords [en]
equating, linking, simulation
National Category
Probability Theory and Statistics
Identifiers
URN: urn:nbn:se:umu:diva-164377DOI: 10.1177/0146621618824855ISI: 000485908600002PubMedID: 31551638Scopus ID: 2-s2.0-85061645294OAI: oai:DiVA.org:umu-164377DiVA, id: diva2:1369480
Funder
Swedish Research Council, 2014-578Available from: 2019-11-12 Created: 2019-11-12 Last updated: 2020-09-15Bibliographically approved

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Wiberg, Marie

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
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  • Other locale
More languages
Output format
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  • rtf